rfc9071v2.txt   rfc9071.txt 
skipping to change at line 727 skipping to change at line 727
| With audio and video media, the CSRC list would often contain | With audio and video media, the CSRC list would often contain
| all participants who are not muted, whereas text participants | all participants who are not muted, whereas text participants
| that don't type are completely silent and thus are not | that don't type are completely silent and thus are not
| represented in RTP packet CSRC lists. | represented in RTP packet CSRC lists.
3.10. Empty T140blocks 3.10. Empty T140blocks
If no unsent T140blocks were available for a source at the time of If no unsent T140blocks were available for a source at the time of
populating a packet but already-transmitted T140blocks are available populating a packet but already-transmitted T140blocks are available
that have not yet been sent the full intended number of redundant that have not yet been sent the full intended number of redundant
transmissions, then the primary T140block in the packet is composed transmissions, then the primary area in the packet is composed of an
of an empty T140block and populated (without taking up any length) in empty T140block and included (without taking up any length) in the
a packet for transmission. The corresponding SSRC SHALL be placed as packet for transmission. The corresponding SSRC SHALL be placed as
usual in its place in the CSRC list. usual in its place in the CSRC list.
The first packet in the session, the first after a source switch, and The first packet in the session, the first after a source switch, and
the first after a pause SHALL be populated with the available the first after a pause SHALL be populated with the available
T140blocks for the source selected to be sent as the primary, and T140blocks for the source selected to be sent as the primary, and
empty T140blocks for the agreed-upon number of redundancy empty T140blocks for the agreed-upon number of redundancy
generations. generations.
3.11. Creation of the Redundancy 3.11. Creation of the Redundancy
skipping to change at line 1150 skipping to change at line 1150
The default maximum rate of reception of "text/t140" real-time text, The default maximum rate of reception of "text/t140" real-time text,
as specified in [RFC4103], is 30 characters per second. The actual as specified in [RFC4103], is 30 characters per second. The actual
rate is calculated without regard to any redundant text transmission rate is calculated without regard to any redundant text transmission
and is, in the multiparty case, evaluated for all sources and is, in the multiparty case, evaluated for all sources
contributing to transmission to a receiver. The value MAY be contributing to transmission to a receiver. The value MAY be
modified in the "cps" parameter of the "fmtp" attribute for the modified in the "cps" parameter of the "fmtp" attribute for the
"text/t140" format of the "text" media section. "text/t140" format of the "text" media section.
A mixer combining real-time text from a number of sources may A mixer combining real-time text from a number of sources may
occasionally have a higher combined flow of text coming from the occasionally have a higher combined flow of text coming from the
sources. Endpoints SHOULD therefore specify a suitable higher value sources. Endpoints SHOULD therefore include a suitable higher value
for the "cps" parameter, corresponding to its real reception for the "cps" parameter, corresponding to its real reception
capability. The default "cps" value 30 can be assumed to be capability. The default "cps" value 30 can be assumed to be
sufficient for small meetings and well-managed larger conferences sufficient for small meetings and well-managed larger conferences
with users only making manual text entry. A "cps" value of 90 can be with users only making manual text entry. A "cps" value of 90 can be
assumed to be sufficient even for large unmanaged conferences and for assumed to be sufficient even for large unmanaged conferences and for
cases when speech-to-text technologies are used for text entry. This cases when speech-to-text technologies are used for text entry. This
is also a reachable performance for receivers in modern technologies, is also a reachable performance for receivers in modern technologies,
and 90 is therefore the RECOMMENDED "cps" value. See [RFC4103] for and 90 is therefore the RECOMMENDED "cps" value. See [RFC4103] for
the format and use of the "cps" parameter. The same rules apply for the format and use of the "cps" parameter. The same rules apply for
the multiparty case. the multiparty case.
skipping to change at line 1425 skipping to change at line 1425
switch if appropriate. Increase the display count by 1. switch if appropriate. Increase the display count by 1.
CR LF (U+000D U+000A): A supported, but not preferred, way of CR LF (U+000D U+000A): A supported, but not preferred, way of
requesting a new line. Check and perform a source switch if requesting a new line. Check and perform a source switch if
appropriate. Increase the display count by 1. appropriate. Increase the display count by 1.
INT (ESC U+0061): Interrupt (used to initiate the mode negotiation INT (ESC U+0061): Interrupt (used to initiate the mode negotiation
procedure). The display count SHALL NOT be altered. procedure). The display count SHALL NOT be altered.
SGR (U+009B Ps U+006D): Select Graphic Rendition. Ps represents the SGR (U+009B Ps U+006D): Select Graphic Rendition. Ps represents the
rendition parameters specified in [ISO6429]. The display count rendition parameters specified in [ISO6429]. (For freely
SHALL NOT be altered. The SGR code SHOULD be stored for the available equivalent information, please see [ECMA-48].) The
current source. display count SHALL NOT be altered. The SGR code SHOULD be stored
for the current source.
SOS (U+0098): Start of String. Used as a general protocol element SOS (U+0098): Start of String. Used as a general protocol element
introducer, followed by a maximum 256-byte string and the ST. The introducer, followed by a maximum 256-byte string and the ST. The
display count SHALL NOT be altered. display count SHALL NOT be altered.
ST (U+009C): String Terminator. End of SOS string. The display ST (U+009C): String Terminator. End of SOS string. The display
count SHALL NOT be altered. count SHALL NOT be altered.
ESC (U+001B): Escape. Used in control strings. The display count ESC (U+001B): Escape. Used in control strings. The display count
SHALL NOT be altered for the complete escape code. SHALL NOT be altered for the complete escape code.
skipping to change at line 1787 skipping to change at line 1788
As already stated in Section 3.18, security in media SHOULD be As already stated in Section 3.18, security in media SHOULD be
applied by using DTLS-SRTP [RFC5764] at the media level. applied by using DTLS-SRTP [RFC5764] at the media level.
Further security considerations specific to this application are Further security considerations specific to this application are
specified in Section 3.18. specified in Section 3.18.
11. References 11. References
11.1. Normative References 11.1. Normative References
[ECMA-48] Ecma International, "ECMA-48: Control functions for coded
character sets", 5th edition, June 1991,
<https://www.ecma-international.org/publications-and-
standards/standards/ecma-48/>.
[ISO6429] ISO/IEC, "Information technology - Control functions for [ISO6429] ISO/IEC, "Information technology - Control functions for
coded character sets", ISO/IEC ISO/IEC 6429:1992, December coded character sets", ISO/IEC ISO/IEC 6429:1992, December
1992, <https://www.iso.org/obp/ui/#iso:std:iso- 1992, <https://www.iso.org/obp/ui/#iso:std:iso-
iec:6429:ed-3:v1:en>. iec:6429:ed-3:v1:en>.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997, DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/info/rfc2119>. <https://www.rfc-editor.org/info/rfc2119>.
 End of changes. 4 change blocks. 
7 lines changed or deleted 13 lines changed or added

This html diff was produced by rfcdiff 1.48. The latest version is available from http://tools.ietf.org/tools/rfcdiff/